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WASHINGTON — Top scientists and career employees at the Food and Drug Administration opposed agency regulations that weaken consumers' ability to sue drug makers, congressional investigators said Wednesday.

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At issue is language in a drug labeling rule from 2006 that effectively limits when people can sue in state court over injury claims involving medications. The FDA contends federal regulations prevail when there is a conflict with state law. This concept is called pre-emption.

Internal agency documents showed that career officials opposed this approach, according to a report released by Rep. Henry Waxman, chairman of the House Oversight and Government Reform Committee. In the past, the agency had viewed private suits as an additional layer of protection against unsafe drugs, the report said.

"Much of the argument for why we are proposing to invoke pre-emption seems to be based on a false assumption that the FDA approved labeling is fully accurate and up-to-date in a real time basis," the report quoted Dr. John Jenkins, who oversees FDA's new drug reviews, as saying. "We know that such an assumption is false."

Patients injured by drugs have won suits against drug manufacturers for failing to warn against certain dangers.

A duty to warn?In a case to be argued before the Supreme Court on Monday, a Vermont woman sued Wyeth after she lost her right arm below the elbow following a high-volume injection of the drug Phenergan. The injection accidentally punctured an artery, prompting gangrene to set in. Levine argued that the company had a duty to warn consumers that such injections could have devastating consequences. The state courts agreed, awarding her nearly $7 million.

Wyeth appealed, saying it was protected from such suits. It argued a state court cannot overrule the FDA's judgment on label warnings.

FDA scientists had weighed the risks and benefits of Phenergan, used to treat nausea and allergies, when it approved the prescribing literature, or label, as a guide for doctors. The FDA was aware of risks associated with injecting some forms of Phenergan, but the label did not specifically warn about the technique used with Levine.

The FDA said in its 2006 rule and in a 2008 rule that state suits could encourage drug makers to propose unnecessary labeling. Such labeling could result in scientifically unsubstantiated warnings and less use of beneficial treatments.

Waxman's staff obtained documents rejecting that warning. Jane Axelrad, an associate director for policy at the agency, wrote: "We rarely find ourselves in situations where sponsors want to disclose more risk information than we think is necessary," she said. "To the contrary, we usually find ourselves dealing with situations where sponsors want to minimize the risk information."

The report said the FDA has yet to provide a complete set of documents that would show communications between the White House and the agency, but some documents suggested the agency and the White House would not go forward with a rule on labeling until the pre-emption changes were included.

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